html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}
*{
  box-sizing: border-box;
}
.clear{
  clear: both;
}
.row {
  display: flex;
  flex-direction: row;
  box-sizing: border-box;
}

.column {
  display: flex;
  flex-direction: column;
}

.flex-1 {
  flex: 1;
  position: relative;
}

.flex-3 {
  flex: 3;
  position: relative;
}
.flex-row {
  display: flex;
  flex-direction: row;
}
.contents {
  position: relative;
}
.center{
  text-align: center;
}
.left{
  text-align: left;
}
.right{
  text-align: right;
}
.fade-enter,.fade-leave-to{
  opacity: 0;
}
.fade-enter-to,.fade-leave{
  opacity: 1;
}
.fade-enter-active,.fade-leave-active{
  transition: all 0.3s;
}
/* // 滚动条整体部分 */
::-webkit-scrollbar {
    width: 10px; 
    height: 200px; 
}

/* //滚动的滑块 */
::-webkit-scrollbar-thumb {
    border-radius: 5px;
    background-color: #9ED8F5 
}

/* //内层滚动槽 */
::-webkit-scrollbar-track-piece {
    border-radius: 5px;
    background-color: #E2E2E2;
}